Top-prop for carriages



(No Model.)

L. SAWYER.

TOP PROP FOR GARRIAGES. No. 248,887. Patented Nov. 1,1881,

N. PETERS Phumuxhn n hu. Wash ngton ac.

Uses STATES Farce.

ATENT TOP-PROP FOR CARRlAGES.

SPECIFICATION forming part of Letters Patent No. 248,887, dated November 1, 1881.

Application filed September 17, 1881.

To all whom it may concern:

Be it known that I, LEONARD SAWYER, of Merrimac, county of Essex, State of Massachusetts, have invented a certain new and useful Improvement in Top-Props for Carriages, of which the following is adcscription sufficieutly t'ull, clear, and exact to enable any person skilled in the art or science to which my invention appertains to make and use the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure 1 is an isometric-a1 perspective view; Fig. 2, a vertical longitudinal section; and Fig. 3, a section of the retaining-thimble.

Like letters indicate corresponding parts in the different figures of the drawings.

My present invention relates to that class of top-props in which the body is detachable from the plate, being designed as an improvement on the prop secured to me by Letters Patent of the United States numbered 163,812, bearing date May 25, 1875; and it consists in a novel construction and arrangement of parts, as hereinafter more fully set forth and claimed, by which a more effective device of this character is produced than is now in ordinary use.

In the drawings, A represents the plate; B, the body; 0, the nut; D, the thimble, and E E the washers.

The body B is exteriorly threaded at its inner end to form the lefthand screw F, which fits a corresponding female screw in the stud or hub Gr, projectingoutwardly from theplate A.

The thimble D has a hole in its top or outer end, through w hich the body B passes, and is provided with a rabbet or shoulder, H, which engages with a boss or projection, I, on the body A when the thimble is turned down into position. i

The stud G is cxteiiorly threaded to form a right-hand screw, which fits a corresponding female screw, J, in the thiinble D.

The body B is grooved or channeled longitudinally at K to receive corresponding projections m m on the washers E, between which washers the braces (not shown) are arranged when the prop is in use.

(No model.)

The boss I of the body B, when the body is top of the carriage projects, the raw edge of the same around the stud Gr being covered by the lower or inner end of the thimble.

A difficulty has heretofore existed in props of this description, arising from the loosening or unscrewing of the body Bin the stud G, caused by the strain or action of the braces 011 the body. This difficulty or imperfection is fully obviated by threading the interior and exterior screws of the stud G in opposite directions-that is to say, making them respectively left and right hand screws-so that when the body B is in position, as shown, and the thimble D fully turned down, the unscrewing of the body cannot take place, accidentally or otherwise, without first unscrewing the thimble, as the same would operate to turn the thimble more firmly down onto the boss I.

It will be obvious that the stud Gr may be provided with an exterior left-hand screw and an interior right-hand screw in place of those shown, the thimble D and body B being respectively threaded to correspond therewith, without departing from the spirit of my invention.

Having thus explained my improvement, what I claim is In a top-prop for carriages, the body B, provided with the left-hand screw F, and thimble D, provided with the right-hand screw J, in combination with the stud Gr, properly threaded to receive the same, substantially as speci- 

